334 SUMMARY OF CURRENT RESEARCHES RELATING TO 



two hepatics and 14 mosses recorded from Montserrat by E. Boutelou, 

 and not included in the author's own collections. Two further species 

 are recorded by Lagasca, but one of these, Hypnum cristacastrensis, is 

 regarded by the author as being probably the H. molluscum so common 

 on the mountain. 



North American Mosses.* — J. M. Holzinger has just issued the 

 last fascicle of Century II. of the " Musci Acrocarpi Boreali- Americana," 

 and A. J. Grout gives a list of 24 specially interesting plants included 

 in the last two fascicles. Several experienced collectors are at work in 

 Florida and North-west America. 



A. J. Grout f publishes a list of additions to the Bryophyte flora of 

 Long Island, which includes five species of hepaticas and 45 species of 

 mosses, collected by himself and other botanists. 



J. M. Holzinger J has found a sterile species of Grimmia on a ledge 

 of lime rock in Winona County, Minnesota. He submitted it both 

 to Dixon and to Cardot, and gives the opinions of each. They agree 

 in determining it to be G. glauca, though it differs from the type 

 in having longer, stouter, and rougher hair point, and a less glaucous 

 colour. The author discusses the possibility of G. glauca being a hybrid. 

 He holds that the geographical distribution of the plant would tend to 

 argue for its value as a good species. 



Notes on Sphagnum. § — C. Meylan has made careful researches on 

 those species of Sphagnum in the Jura mountains which compose the 

 section Acutifolia. This section is represented in that region by ten 

 species, all carved out of the ancient 8. acutifolium Ehrh. The characters 

 on which these species are found are (1) the form of the cauline leaves ; 

 (2) the system of pores ; (?>) the position of the chlorophyll cells ; 

 (4) the position of the branch leaves. As to the presence or absence of 

 fibres, it is such a variable and inconstant character that it is not worth 

 taking into account. Each of the four specific characters mentioned 

 above is dealt with fully. The species represented in the Jura are 

 8. fimbriatum Wils., 8. Girgensohnii Russ., 8. Russotvii Warnst., S. 

 rubellum Wils., S.fuscum Kling., 8. Warnstorfii Buss., 8. quinquefarium 

 Warnst., 8. subnitens Russ. and Warnst., S. molle Sull., and 8. acutifolium 

 Ehrh. These are arranged in tabular form showing their respective con- 

 nection with S. acutifolium. 



E. Balle || gives a list of 11 species of Sphagnum from Vire, Calvados. 



Sphagnum in Essex.^f — F. J. Chittenden gives an account of the 

 bog mosses of Essex, with a revision of the old records, and defines the 

 distribution of the species at the present day. Adopting Warnstorf's 

 system of classification, he enumerates 12 species under which are 

 grouped 14 varieties. The peculiar conditions of well-lighted stagnant 

 water supply which the Sphagnaceae require occur at a few places only 

 in Essex, namely where the Bagshot Sands or Glacial Gravel overlie the 

 impervious Boulder Clay or London Clay. Possibly the large amount 



* Bryologist, ix. (1906) p. 24. t Tom. cit., pp. 26-8. 



X Tom. cit., pp. 29-31. 



§ Rev. Bryolog., xxxiii. (1906) pp. 17-24. || Tom. cit., pp. 29-30. 

 ^ Essex Naturalist, xiv. (1906) pp. 111-16. 



